isabouttime - let us know what you find out.
My iphone 3G (and now 3GS) with MM almost instantly sync with my Mac Mini, Outlook 2007 on my work Vista PC, and on my Laptop Vista PC as well as the online. If I enter a calendar entry on my iphone, they show up very quickly in all the other places and does the same if entered in any of those computers or web page.
Now that I have the 3GS and gave my wife the 3G I want the same thing you are trying to achieve. I enter something on my calendar and it shows up on mine and hers.
I know a buddy used Google Calendars and I am fairly certain it works there, but since I have MM and alot of data there, I would rather keep it with that than move to Google.
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